Publications by authors named "Y Shi"

20,719 Publications

Pulsed Laser-Induced Dewetting and Thermal Dewetting of Ag Thin Films for the Fabrication of Ag Nanoparticles.

Nanotechnology 2021 May 7. Epub 2021 May 7.

Department of Chemistry, University of Calgary, 2500 University Drive, N W, Calgary, Alberta, T2N 1N4, CANADA.

Two different dewetting methods, namely pulsed laser-induced dewetting (PLiD) - a liquid-state dewetting process and thermal dewetting (TD) - a solid-state dewetting process, have been systematically explored for Ag thin films (1.9 - 19.8 nm) on Si substrates for the fabrication of Ag nanoparticles (NPs) and the understanding of dewetting mechanisms. The effect of laser fluence and irradiation time in PLiD and temperature and duration in TD were investigated. A comparison of the produced Ag NP size distributions using the two methods of PLiD and TD has shown that both produce Ag NPs of similar size with better size uniformity for thinner films (< 6 nm), whereas TD produced bigger Ag NPs for thicker films (≥ 8 - 10 nm) as compared to PLiD. As the film thickness increases, the Ag NP size distributions from both PLiD and TD show a deviation from the unimodal distributions, leading to a bimodal distribution. The PLiD process is governed by the mechanism of nucleation and growth of holes due to the formation of many nano-islands from the Volmer-Weber growth of thin films during the sputtering process. The investigation of thickness-dependent NP size in TD leads to the understanding of void initiation due to pore nucleation at the film-substrate interface. Furthermore, the linear dependence of NP size on thickness in TD provides direct evidence of fingering instability, which leads to the branched growth of voids.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1088/1361-6528/abfee7DOI Listing
May 2021

Does theme game-based teaching promote better learning about disaster nursing than scenario simulation: A randomized controlled trial.

Nurse Educ Today 2021 Apr 24;103:104923. Epub 2021 Apr 24.

Wuhan University, School of Health Sciences Faculty of Nursing, No. 115 Donghu Road, Wuchang, Wuhan, Hubei Province 430071, PR China. Electronic address:

Background: With the development of information technology, game-based teaching has continuously attracted the attention of nursing educators. It has been proven that games, as an auxiliary tool of traditional teaching, can improve students' learning motivation and learning effects. However, compared with the traditional scenario simulation teaching, whether game-based teaching has obvious advantages is still unknown.

Objectives: This study aimed to explore whether theme game-based teaching is more effective than scenario simulation in improving students' disaster nursing competency.

Design: A randomized controlled trial.

Setting: The study was conducted at a provincial vocational college in Xiaogan, Hubei, China.

Participants: A total of 104 sophomore nursing students (intervention group = 51, control group = 53) participated.

Methods: After the participants were randomly assigned to the intervention group or control group, disaster-themed games were used in the intervention group, while multi-station disaster simulation was applied in the control group. Pre- and post-tests were conducted to assess the participants' disaster nursing competence using the Questionnaire of Disaster Rescue Ability.

Results: After the intervention, disaster nursing competence levels were significantly higher in the intervention group than in the control group (4.04 ± 0.43 vs. 3.77 ± 0.45, P = 0.002). Three domains of disaster nursing competence, cognition (4.05 ± 0.56 vs. 3.75 ± 0.48, P = 0.004), skill (3.88 ± 0.50 vs. 3.62 ± 0.53, p = 0.008) and affective response (4.25 ± 0.42 vs. 4.02 ± 0.48, P = 0.010), were also significantly higher in the intervention group.

Conclusions: Compared with scenario simulation, theme game-based teaching is more effective in improving the disaster nursing competence of nursing students.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.nedt.2021.104923DOI Listing
April 2021

Global Polarization of Ξ and Ω Hyperons in Au+Au Collisions at sqrt[s_{NN}]=200  GeV.

Phys Rev Lett 2021 Apr;126(16):162301

University of California, Davis, California 95616.

Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at sqrt[s_{NN}]=200  GeV. The measurements of the Ξ^{-} and Ξ[over ¯]^{+} hyperon polarization have been performed by two independent methods, via analysis of the angular distribution of the daughter particles in the parity violating weak decay Ξ→Λ+π, as well as by measuring the polarization of the daughter Λ hyperon, polarized via polarization transfer from its parent. The polarization, obtained by combining the results from the two methods and averaged over Ξ^{-} and Ξ[over ¯]^{+}, is measured to be ⟨P_{Ξ}⟩=0.47±0.10(stat)±0.23(syst)% for the collision centrality 20%-80%. The ⟨P_{Ξ}⟩ is found to be slightly larger than the inclusive Λ polarization and in reasonable agreement with a multiphase transport model. The ⟨P_{Ξ}⟩ is found to follow the centrality dependence of the vorticity predicted in the model, increasing toward more peripheral collisions. The global polarization of Ω, ⟨P_{Ω}⟩=1.11±0.87(stat)±1.97(syst)% was obtained by measuring the polarization of daughter Λ in the decay Ω→Λ+K, assuming the polarization transfer factor C_{ΩΛ}=1.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1103/PhysRevLett.126.162301DOI Listing
April 2021

External application of N alleviates toxicity of Cd on poplars via starch and sucrose metabolism.

Tree Physiol 2021 May 7. Epub 2021 May 7.

College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China.

Phytoremediation technology can help achieve moderate cost and considerable effect, with respect to the remediation of heavy metal pollution in soil and water. Many previous studies have suggested the role of N in the alleviation of effects of heavy metal on plants. Herein, we sought to determine the molecular mechanisms by which additional N supplementation mitigates Cd toxicity in poplars using a combination of physiological, transcriptomic, and phosphoproteomic analyses. The application of N can alleviate the toxicity of Cd to Populus by reducing chlorophyll degradation, maintaining the stability of ions inside and outside the cell membrane, and increasing the soluble sugar content. Plant samples from the control (CK), Cd stress, and Cd_N treatments were used for an integrated analysis of the transcriptome, as well as for phosphoproteomics analysis. Moreover, 1,314 differentially expressed genes (DEGs) and 119 differentially expressed kinase genes were discovered. Application of additional N under Cd stress promoted the phosphorylation process. Furthermore, 51 significantly enriched phosphorylated protein sites and 23 differentially expressed kinases were identified using phosphoproteomic and proteomic analyses. Importantly, transcriptomic and phosphoproteomic analyses jointly determined that the application of N could activate corresponding gene expression [UDP-glucose-dehydrogenase (UGD), GAUT, PME, pectin lyase, UDP-glucose-pyrophosphorylase 2 (UGP2), sucrose phosphate synthase (SPS), SUS, and SPP2] and protein phosphorylation (UGP2 and SPS) in the sugar and starch synthesis pathways, which promoted the synthesis of sucrose and soluble sugar and subsequently alleviated the damage caused by Cd.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1093/treephys/tpab065DOI Listing
May 2021